Abstract
Fast neutrons of energies in the multi-MeV region are of great interest for biological and medical applications because of their special type of interaction with tissue-like material. The neutron energy is delivered to the tissue by one or several of the following means: (a) recoil protons, (b) recoil heavy particles, (c) nuclear disintegration, and (d) low-energy protons from neutron reactions with nitrogen and γ rays from neutron capture in hydrogen. This report discusses intensity estimations for different types of neutron beams, and is based on averaged and interpolated values from published and unpublished sources. In making the estimates, we have assumed realistic values for the distance from neutron source to exposure area. This assumption is necessary for two reasons: (a) to allow for the installation of sufficient shielding to reduce the background radiations in the irradiation area, and (b) to allow for neutron beam divergence so that reasonably large objects can be irradiated uniformly.
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